1000021031 has 4 divisors (see below), whose sum is σ = 1016970600. Its totient is φ = 983071464.

The previous prime is 1000021027. The next prime is 1000021069. The reversal of 1000021031 is 1301200001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1000021031 - 2² = 1000021027 is a prime.

It is a super-2 number, since 2×1000021031² = 2000084124884605922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8474696 + ... + 8474813.

It is an arithmetic number, because the mean of its divisors is an integer number (254242650).

Almost surely, 2^1000021031 is an apocalyptic number.

1000021031 is a deficient number, since it is larger than the sum of its proper divisors (16949569).

1000021031 is an equidigital number, since it uses as much as digits as its factorization.

1000021031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16949568.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1000021031 is about 31623.1091292428. The cubic root of 1000021031 is about 1000.0070102842.

Adding to 1000021031 its reverse (1301200001), we get a palindrome (2301221032).

The spelling of 1000021031 in words is "one billion, twenty-one thousand, thirty-one".